Windshield-cleaner motor



' July 12 1927 F. Gf FOLBERTH WINDSHIELD CLEANER MOTOR Filed Aug. 1i, 1924 2. sheets-sheet 1 l5 vd' July 12,1927.

F. G. FOLBERTH wINDsHIELD CLEANER MOTOR Filed Aug. i1, 1924 z sheets-.sheet 2 FRED G. sommaria, F l,

TRIGO PRODUCTS CORPOBATI N, 0F

NEW Yoan.'

anon, nr sim new Yoan, a

A I Application led August 11, 1924. Serial Eo. 731,283.

My invention relates to an improved fluid portion of the frame thereof. In each end pressure motor, more particularly a' suction operated motor adapted to be incorporated in windshield cleaners embodying the broad principles and combinations of parts disf closed and claimed in F olberth Patent No. 1,405,77 3, dated February 7, 1922.

VVindshieldfcleaners of the type disclosed in the aforementioned patent are preferably operated by the suction existing 1n the intake manifold of the internal combustion engneof an automotive vehicle with which the cleaner is associated. This suction varies within wide limits and often is meager in l5 degree. It is, therefore, hi hly desirable that the motor of such a win shield cleaner be capable of performing its appointed task when the degree of suction available for its operation is very small. As a practical mat,- ter, itis also importantthat such a motor operate with a minimum of internal power losses and be of minimum height in order that when operatively mounted on -a windshield or the frame thereof, it will not un- V duly obstruct vision through the windshield.

,It was with-these andother ractical considerations in mindAthat I eveloped the windshield cleaner motor disclosed in the accompanying drawings, in which Figure 1 is a transverse section through the upper part of a windshield shown.: 1n end elevation, a windshield cleaner embodying my invention attached thereto;

Figure 2 is a front elevation of the motor taken on the line 2-2 of Figure 1 Figure 3 is a longitudinal section through the'motor taken on the line 3-3 of Figure 1 and looking forwardly;

Figure 4 is a transverse section through 40 the motor taken on the line 4-4 of Figure 3 Figure 5 is a detail plan section of the snapover valve mechanism taken on the line 5--5 of Figure 4;

Figure 6 is a detail section, showing the shuto valve, takenv on' the line 6-6 vof i re is a on itu a :gu ry sectidgili1 taken on the line 7-7 of re 4, and showing the snapover valve mec anism with the cylindrical housing removed.

Briefly described, my suction motor comprises a cylindrical housing closed at both ends and preferably disposed at the rearward side of the windshield along the upper 'of a wide clamping rin of the housing (Fig. 3) is reci rocably mounted a pair of spaced pistons w ch are rigldly connected by hollow piston :'fmV Alrtlght partitions are provided toward the respective ends vo1 the housing 'and intermediate the pistons of eachpair, whereb are formed suction chambers A, B, C, E, and F, and a central atmospheric ressure compartment G. The two pairs o pis.- tons are Arigidly connected by a rack which l extends across the bottom of the compartment G and is enga ed by a toothed sector carried by the rock-shaft In a typical cycle of operations, suction is applied to the suction chambers B and D and through one of the hollow piston stems to the chamber F. The other three chambers A, C and E are at this time relieved to atmospheric pressure; therefore the applied suction is ef- 75 fective over the.. area of three pistons to pull the rack to the ri ht. When the limit vof the movement to t eright is reached, suitable valve mechanism relieves the 1w. v B, D and F toatmos heric pressure d ap-` W plies suction to the c embers E and C, and throu h a hollow piston stem to the chamber A; w ereupon the applied suction is again eective over the a of three pis to move the rack to the left. v ln this way the cleaner element connected with the rock shaft is operated in the usual mer, but with `1 :itially thrice the wer able in the type of motor own in the previously mentioned patent when the available suction and the diameter and stroke of the pistons are the same.

The cylindrical housing v (hereinafter called the cylinder) is indicated at 10. It is formed in part b intermediate tubular oe portions 11 and 12 eld in alignment and. secured to a block or casting 13 by means 14. The cylinder is completed by the en or cap portions 15 I and 16, the inner ends of the lsald cap porloe tions being ,enlarged and fitting over the outer ends of the tubular portions 11 and 12 with the cylindrical danges 17 of the partitions 18 and 19, respectively, inse therebetween to form a fluid tight joint. The 1w clam ing ring 14 is C-shaped, one end being caug t b hook shapedlugs 20 at the lower side of t el block 13, while the other end is ulled down upon the top side of the block y cap screws 21. In motor .i 330 throu h theband 14 or the ingressof air` to sai compartment G.

' The forward .side of the block 13, that is, the side which iits against the rearward side `ofthe windshield frame, is rovided vwith a pair of tapped holes for ableholes in the windshie d frame and serve to clam the. motor tightly against the frame. ilhe block 13 is bored to rovlde a journal for the rock-shaft 23 whic extends through asuitable hole in the windshield frame intermediate the cap screws 22, and

carries at its free end a'n arm or rod 24' bearipg at its end the squeegee 24. The rearward end of the shaft 23 is journaled in a bearing formed by mating semi-c lindrical bosses struck from the juxtapose ends of the tubular portions 11 and 12 of the cylinder, the bearing formed by these bosses being indicated at 25 (Fig. 4). An arm 26 is preferably provided at thenrear -end of the shaft vfor Swingin the squeegee to one of its upper positions w en the motor leaves it extending across the field of vision.

A piston" 27 reciprocates in the portion 15 of the cylinder, and a similar piston 28 reciprocates in the portion 1 6. Each -of these pistons comprises a pai/r of cup leathers 294 and spreaders 30 clamped,4 between plates 31. Pistons 32 and 33 reciprocate in the tubular .portions 11 and 12, respectively; these pistonsbeing generally similar to the istons 27 and 28, except that theyhave single cup leathers. The pistons 27 and 32 are rigidly connected in spaced relation by a hollow at its central o ening stem. lA similar arrangement o 4piston stem 34 and,` if desired, bya spacing sleeve 35 surrounding the stem. A pair of opposite'ly disposed and centrally apertured leathers 36 are clamped to the partition 18 as by rivets 37, for the e previouslyv mentioned purpose of sea ing -t the piston suction chambers B and C along prising a ,piston stein 38, is utilized for c onnecting lstons 28 and 33 and forl sealing the cham rs D and E, each from the other.

The two pairs of pistons are connected by the rack 39, which is in the form of a l'metal stamping extending along the bottom of the r central compartment G, and provided at its ends with l upturned portions 40 through which the ends of the piston' stems 34 and 38 extend and over which they are peened. It will thus be seen that the pistons 27, 32, 33 and 28, .the piston stems 34 and38, and

.the rack 39,all reciprocate as a unit. The

teeth of the rack 39 are formed by punching a series ofy holes along the horizonte t e reception of the cap screws 22 which ass through suitparts, comportion thereof. The rack 39 is engaged by the toothed sector 41, which insection is 1n the form of an Inverted J, the long and short legs of which are apertured for the passage of the rock-shaft 23 to which the sector is secured bya rivet 42. The sector is held against axial movement by a collar 43 and a bearing boss 44 extending inwardly from the block 13. s

Suction from the intake manifold of the en 'ne is applied through the tubing 45, p.

an past a manually adjustable needle valve 46, to an inlet port 47 terminating in a valve 'face 48 on the inner side of the block 13 and somewhat below the shaft 23. At each side of the port 47 and in horizontal alignment therewith are valve ports 49 and 50. The valve port 49 communicates with a conduit 51 extending along the forward side of the cylinder and extending through the wall thereof to communicate with the interior of the chamber C. Another conduit 52 also leads from the valve port 49 `in the o posite direction along the forward side of tlie-cylinder and passes through the wall thereof to communicate with the chamber E.

The piston stem 34, it may be explained, is closed by a plug 53 at its inner end, and is provided wlth an openin 54, whereby lsuction admitted to the cham er .C is communicated through the said stem to the suction chamber A. The istpn stem-38 similarly carries an end p ug 55, and has an opening '56 for establishing communication between the suction chambers D and F.

The valve port 50 connects with a pair of oppositely extending conduits 57 and 58 which communicate with the suction chambers D and B, respectively. The several conduits 51, 52, 57 yand`58 are preferably of small diameter brass tubing and are well soldered at the4 points where theyy penetrane the cylinder walls to make airtight sea s.

A valve arm 59 is freely pivoted to the block 13 by a cap screw 60, the arm extending around the shaft 23 and hub 44 to a point below the shaft and adjacent theY ports 47, 49 and 50 where it carrles a lvalve isc 61.v The face of the valve disc 61 fits ilatl against the vertical valve face 48 ofthe bloc '13, and is hollowed out centrally to leave a narrow marginal rim to engage the valve face 48. The opposite side of the valve disc carries a small cylindrical lug which fits into a circular aperture "at the free end of the arm 60. The'valve arm 59 has at its free end a downwardly extending U-shaped projection 62 which confines the arm to movement between two stop lugs 63 at the, lower prtion of the block 13. The

movement allowed by these stop lugs is such that when the arm is in its a ernate positions, the valve disc will connect the coinmon suction inlet port 47 with one of the no l valve ports 49 or 50 while relieving the other to atmosphere. A slot 64 cut across the lower side of the boss 44 slidably supports a'trip member 65, the sliding movement of which is limited by integral stop ears 66. At its lower edge the trip member 65 carries a centrally located eye 67. Between the e 'e 67 and a similar eye, in the short leg o the U-shaped projection 62 of the valve arm, is a helical compression spring 68.

The movement allowed the trip member '65 by the ears 66' is greater than that allowed the free end of the valve arm by the lugs 63. Therefore, when the trip member 65 has been moved to the right (Fig. 7) as far as possible, the eye 67 will have passeda dead center relation with the cap screw and the eye of the U-Shaped projection 62, with the result that the compression spring 68 will snap the free end of the arm 59 to the left. Then the trip member isagain moved to the left, the compression spring 68 similarly will snap the free end of the valve arm 59 to the position shown in Figure 7. The arm 59, trip member 65, cornpression spring 68, and stop lugs 63, thus co-operate to form a snapover mechanism for the valve disc 6l.

Because the line of thrust imparted to the. U-shaped projection 62 by the Icompression spring 68' is slightly angular with reference to the connection of the valve arm 59 to the cap screw 60, there is a small component of force tending to hold the valve disc 61' against the face 48 of the blockv 13.

)Vhen in the position shown in Figure 5,

the valve disc'61 establishes communicationy from the suction inlet port 47 through the hollowed out portion of. the valve disc face, and through the Yvalve port 50 and-conduits 57 and 58 to the chambers B and D and through the stem 38 to chamber F. At this time the valve port 49 is open to the atmospheric pressure Vof the compartment G, which atmospheric pressure is communicated throu h the conduits 51 and 52 to the chamlieis fand E. and vthrough the stem'34 to the chamber-A. This results in the movenient of all of the pistons toward the right (Fig. 3), thereby oscillating the shaft 23 and the squeegee counterclockwise. As the pistons near the end of their movement to the right, the left end of the trip member 65 is contacted by the piston 32 and is carried to the ri ht to snap the valve disc out of registry with the port 50 and into registry with thelport 49. The chambers F, D and B are thereby relieved to atmosphere, and suction is applied to the chambers A, C and E. The

. pistons andthe rack are then moved to the left to swing the squeegee in a clockwise' direction through a suita le arc, when the pistony40 willcontact the right end of the trip member 65 and return the valve mechanism to its original position of Figure 7.

It is thus clear that during each movement of the pistons, suction is eectively applied to three pistons. When the Yrack is v i moving to the left (Fig. 3), for example, suction is'being applied over the area of the three pistons 32, 27 and 28. When the rack is moving to the right, suction is applied over the area of the pistons 28,33 and 27.

While I have illustrated and described but this one particular embodiment of my invention, it is to be understood that manychanges may be made therein without 'departing from the scope and spirit of my invention.

What I claim is:

1. A windshield cleaner motor comprising a casing consisting of a central cylindrical section and cup-shaped end sections having their open ends fitting the opposite ends of the central section with an air tight joint, an air tight partition between each end' section and the central section, a -hollowpiston f rod slidably supported in each partition, a piston connected to each end of the rods. one piston operating in each end section and dividing the same-into inner and outer chambers and two pistons operating in the central section and deining end chambersflying between the partitions and the respective pistons, each piston rod establishing .communication between the adjacent end chamber of the central section and the outer chamber of the adjacent end section, means for connecting a source of operating pressure first to one end chamber of the central section and the inner chamber of the remote end sec- NNI tion and then to the opposite end chamber of central section, a hollow piston ro slidably supported in each. partition, a piston connected to each end of the rods, one piston operating in each end section and divid the saine into inner and outer chambersA an two pistons operating in the central section and defining end chambers lying between the partitions and the respective pistons,

each piston rod establishing communication between the adjacent end chamber of the central section and the outer chamber of the adjacent end section, means for` .connecting a siurce of operating p first to one end chamber of the .cent section d ias' ' the housin the inner chamber of the remote end section and then to the opposite end chamber of the central section and the inner chamber of the opposite end section, anda connecting member joining the two pistons in the central section and operatively connected to said means for o rating the same.

3. A win shield cleaner motor comprising an elongated housing with closed ends, avpair of connected pistons and a partition in each .fend of the housing dividing each end into three chambers, the pistons of each pair being arranged on opposite sides of the respective end partitions, means operatively connecting each pair of pistons with the other pair and forv delivering power therefrom, and means adapted first to apply suction to a multiplicity of said chambers and atmospheric pressure to the others of said chambers and then toreverse the application voi suction and atmospheric pressure to said chambers. l

4.' A Windshield cleaner motor comprising an elongated housing with closed ends, a pair of connected pistons and a partition in each end Jof the housing dividing each end into three chambers, means operatively connecting each pair of istons with the other pair and for delivering power from said pistons, and means adapted 'first to apply suction to two of the chambers in one end of and one chamber in the other end ofthe ousing to move the pistons in one direction and then to apply suction to the others of said chambers to move the pistons in the opposite direction.

5. A windshield cleaner motor comprising an elongated housing with closed ends, a pair of connected pistons and a partition in each end of the housing dividing each end 'into three chambers, means operatively'connecting each air of pistons with the other pair and for' elivering power from said pis ltons, each pair of pistons comprisin ahollow piston rod by virtue of which t e pressu'res inthe chambers located on corresponding sides of the pistons of the pair are e ualized, and means for subjecting one pair o the hollow piston rod connected chambers to suction and the companion pair to atmospheric pressure.

6. A windshield cleaner motor compris-i necting each pair'of connected pistons withv the other pair and for delivering power from said pistons, pressure equalizing passages affording communication between the pairs of chambers located on corresponding sides of the pistons of each pair, and means for applying suction to a chamber of bne pair of the communicating chambers and for applying atmospheric pressure to a chamber of the other communicating pair of chambers.

7. A windshield cleaner motor comprising an elongated housing with closed ends, a pair of connected pistons and a partition in each end of the housing dividing each end into three chambers, means operatively connecting each pair of connected pistons to the other and for delivering power fromsaid pistons, yand means adapted first to apply suction to the chambers on correspon ing sides of the pistons in one end of the housing, atmospheric pressure to the chambers on the opposite sides of the pistons in the other. end of the housing, atmospheric pressure to the third chamber in the first mentioned end of the housing, and suction to the third chamber in the second mentioned end of the housing.

8. A windshield cleaner `motor comprising a housing and two connected pairs of `pistons therein affording six faces to which suction may beoperatively applied, power transmitting means arranged between the pairs of pistons and operable thereby, and means for applying suction to three of said piston faces to effect movement of the pistons in one direction and then to apply suction to the others of said piston faces to move the pistons in the opposite direction.

In Witness whereof, I hereunto subscribe 

